Table 5.
Calculation methods for kinematic and kinetic variables in the depth jump test.
| Variable | Abbr. | Calculation |
|---|---|---|
| Jump height (m) | JH | The difference between the maximum height of the center of mass during the flight phase after the propulsion phase and the average height of the center of mass during static standing43 |
| Countermovement depth (m) | CD | The difference between the maximum and minimum height of the center of mass during the braking phase |
| Peak propulsive velocity (m·s− 1) | PPV | The maximum velocity of the center of mass during the propulsion phase |
| Peak braking force (N·kg− 1) | PBF | The maximum vertical ground reaction force during the braking phase |
| Peak propulsive force (N·kg− 1) | PPF | The maximum vertical ground reaction force during the propulsion phase |
| Peak braking power (W·kg− 1) | PBP | The maximum value of the product of vertical ground reaction force and the velocity of the center of mass at each moment during the braking phase |
| Peak propulsive power (W·kg− 1) | PPP | The maximum value of the product of vertical ground reaction force and the velocity of the center of mass at each moment during the propulsion phase |
| Vertical braking impulse (Ns·kg− 1) | VBI | The sum of the product of vertical ground reaction force and time at each moment during the braking phase19,20 |
| Vertical propulsive impulse (Ns·kg− 1) | VPI | The sum of the product of vertical ground reaction force and time at each moment during the propulsion phase19,20 |
| Energy storage (J·kg− 1) | EST | The integral over the braking phase of the product of vertical ground reaction force and countermovement depth at each time point (Fig. 2)21,22 |
| Energy release (J·kg− 1) | ERE | The integral over the propulsion phase of the product of vertical ground reaction force and countermovement depth at each time point (Fig. 2)21,22 |
| Net energy release (J·kg− 1) | NERE | The difference between energy release and energy storage21,22 |